CN208656749U - Terminal coupling circuit - Google Patents
Terminal coupling circuit Download PDFInfo
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- CN208656749U CN208656749U CN201820580658.8U CN201820580658U CN208656749U CN 208656749 U CN208656749 U CN 208656749U CN 201820580658 U CN201820580658 U CN 201820580658U CN 208656749 U CN208656749 U CN 208656749U
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- 230000008878 coupling Effects 0.000 title claims abstract description 93
- 238000010168 coupling process Methods 0.000 title claims abstract description 93
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 93
- 230000003068 static effect Effects 0.000 claims description 13
- 230000003213 activating effect Effects 0.000 claims description 10
- 230000004913 activation Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 24
- 238000000034 method Methods 0.000 description 14
- 230000005611 electricity Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 101100484930 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) VPS41 gene Proteins 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000011514 reflex Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/28—Impedance matching networks
- H03H11/30—Automatic matching of source impedance to load impedance
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/689—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors with galvanic isolation between the control circuit and the output circuit
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Logic Circuits (AREA)
- Dc Digital Transmission (AREA)
Abstract
The utility model relates to terminal coupling circuits.One purpose of the utility model is to provide terminal coupling circuit.The terminal coupling circuit includes: the first and second nodes；First interconnected in series of the first switch device and the first impedor that are coupled between first and second node；Second interconnected in series of the second switch device and the second impedor that are coupled between first and second node；With the first and second control circuits, it is coupled respectively with the control terminal of the control terminal of the first switch device and the second switch device, first and second switching device is selectively wherein activated by first and second control circuit, selectable impedance is set between the first and second nodes of the terminal coupling circuit.One embodiment has solved at least one of technical problem and has realized the corresponding advantageous effects of the utility model.
Description
Technical field
This disclosure relates to the changeable terminal with multiple impedances selection.
Background technique
In order to provide good power transmission and minimize the signal reflex between transmission line and receiver, receiver
Input impedance preferably matches with the impedance of transmission line.In the case where transfer impedance is known in advance, receiver can be set
It is calculated as making the impedance of its impedance matching transmission line.However, in the case where transmission line impedance is unknown, or receiver will be with tool
In the case where having the transmission line of different impedances to be used together, receiver cannot be designed to make its input resistant matching transmission line
Impedance.
Therefore the terminal coupling circuit for needing to have adjustable impedance, which can carry out according to the needs of specific application can
Adjust setting.
Utility model content
One purpose of the utility model is to provide terminal coupling circuit.
Circuit described herein and method provide a kind of novel and effective mode, and multiple termination impedance values are incorporated to
To adapt to multiple transmission line properties in changeable terminating circuit.
According to the one side of the utility model, terminal coupling circuit includes: the first and second nodes；It is coupled in described first
First interconnected in series of first switch device and the first impedor between second node；It is coupled in described first and second
Second interconnected in series of second switch device and the second impedor between node.First and second control circuits respectively with institute
State the control terminal coupling of the control terminal and the second switch device of first switch device.It is controlled by described first and second
Circuit processed selectively activates first and second switching device, the terminal coupling circuit the first and second nodes it
Between selectable impedance is set.
Preferably, by selectively only activating first switch device between the first and second switching devices, in terminal
First selectable impedance value is set between the first and second nodes of match circuit, and passes through the first and second switch of activation
Device, setting is less than the described first selectable impedance value between the first and second nodes of terminal coupling circuit second can
The impedance value of selection.
Preferably, terminal coupling circuit further includes the first and second static discharges for being respectively coupled to the first and second nodes
(ESD) circuit.
Preferably, terminal coupling circuit further includes the third static discharge (ESD) being coupled between the first and second nodes
Circuit.
Preferably, each of first and second control circuits all include charge pump circuit, level shifter circuit or
Isolator circuit.
Preferably, the terminal coupling circuit is by selectively activating first and second by the first and second control circuits
At least one of switching device, is selectively arranged about 100 ohm of impedance between the first and second nodes, and leads to
It crosses and selectively activates at least one of first and second switching devices by the first and second control circuits, first and second
About 120 ohm of impedance is set between node.
Preferably, the value of the first impedor of the first interconnected in series is about 120 ohm, and the of the second interconnected in series
The value of two impedors is about 600 ohm.
Preferably, terminal coupling circuit further include: n interconnected in series of each switching device and respective impedance element coupling
Between the first and second nodes, wherein n is positive integer；With n control circuit, it is coupled to corresponding in n interconnected in series
The control terminal of one switching device, wherein by selectively activating first by first, second and n-th of control circuit,
Second and n-th of interconnected in series switching device, be arranged between the first and second nodes of terminal coupling circuit selectable
Impedance.
According to the another aspect of the utility model, terminal coupling circuit includes: the first, second, and third node；It is coupled in
The interconnected in series of switching device and the first impedor between first and second nodes；With the second impedor, it is coupled in
Between two and third node.Control circuit is coupled to the control terminal of switching device, and is switched by being activated by control circuit
Selectable impedance is arranged in device at the node of terminal coupling circuit.
Preferably, by activating switching device, being arranged first between the first and second nodes of terminal coupling circuit can
The impedance value of selection, and by activation switching device, it is arranged between first and third node of terminal coupling circuit and is higher than
Second selectable impedance value of the first selectable impedance value.
Preferably, terminal coupling circuit further include: n node, wherein n is positive integer；With in each of n node and
N impedor being serially connected between third node, wherein each of other nodes of n node are coupled to n
The respective nodes of the series connection of impedor, wherein being saved by activation switching device in the first of terminal coupling circuit and n
Setting is higher than n each in the first and second selectable impedance values selectable impedance value between point.
Preferably, second node and is shorted at switching device by third node by activation, the of terminal coupling circuit
First selectable impedance value is set between one and second node, and when second and third node not short-circuit each other, is passed through
Switching device is activated, setting is higher than the of the first selectable impedance value between first and third node of terminal coupling circuit
Two selectable impedance values.
Preferably, terminal coupling circuit further includes the first and second static discharges for being respectively coupled to first and third node
(ESD) circuit.
Preferably, terminal coupling circuit further includes the third static discharge (ESD) being coupled between first and third node
Circuit.
Preferably, terminal coupling circuit further includes be respectively coupled to the first, second, and third node first, second and
Three static discharges (ESD) circuit.
Preferably, the second ESD circuit is coupled between second and third node.
Preferably, terminal coupling circuit further includes the 4th ESD circuit being coupled between first and third node.
Preferably, the control circuit includes the charge pump circuit, level shifter circuit or isolation of driving switch device
Device circuit.
Preferably, the terminal coupling circuit is selectively arranged about 100 ohm between the first and second nodes
Impedance, and about 120 ohm of impedance is set between first and third node.
Preferably, the second impedor being coupled between second and third node has about 20 ohm of value
Additional advantage and novel feature will be set forth in part in the description which follows, and for those skilled in the art
It is in part will become below research and when attached drawing it is clear that can be understood by exemplary production or operation.This
The advantages of introduction can by practice or using method described in detailed example discussed below, means and combination each side
Face is achieved and obtained.
One embodiment has solved at least one of technical problem and has realized the corresponding of the utility model
Advantageous effects.
Detailed description of the invention
Attached drawing only depicts one or more embodiments according to this teaching by way of example and not limitation.Attached
In figure, identical appended drawing reference refers to the same or similar element.
Figure 1A -1C is to show to connect and optionally include by transmission line to provide the changeable end of multiple termination impedance values
The transmitter of terminal circuit and the functional block diagram of receiver.
Fig. 2-9 is to provide the functional circuitry figure of the exemplary changeable terminating circuit of multiple termination impedance values, such as can be
Used in the exemplary interconnection of Figure 1A -1C.
Specific embodiment
Cross reference to related applications
This application claims the U.S. Provisional Application No.62/326 that on April 22nd, 2016 submits, 634 equity, it is open in
Appearance is incorporated herein by reference in their entirety.
In the following detailed description, by example, numerous specific details are set forth, in order to provide to the thorough of relevant teachings
Understand.It will be apparent, however, to one skilled in the art that this can be practiced in the case where without these details
Introduction.In other cases, in order to avoid unnecessarily obscuring the aspect of this introduction, do not have in relatively high rank
Well-known method, process, component and/or circuit is described in detail.
Various circuits disclosed herein and method be related to for improve with the terminal coupling circuit of the impedance matching of transmission line,
Such as the impedance matching between receiver or transceiver and transmission line.
It is provided in the integrated circuit receiver and transceiver that terminal coupling circuit can be used for using in a communications system integrated
Changeable terminal.Using changeable terminal, the property of can choose application terminal matching and/or the property of can choose adjust end
Matched value is held to match the transmission line property impedance of connection.Circuit and method presented herein provides a kind of novel and has
The mode of effect is incorporated to multiple termination resistance values in this feature to adapt to multiple transmission line properties.
Now referring in detail to the example for being shown in the accompanying drawings and being discussed below.
Figure 1A shows the general interconnection of the transmitter 101 and receiver 103 by transmission line 105 (or transmission cable).
In the example of Figure 1A, the impedance (or resistance) that receiver 103 can have with the transmission line 105 at receiver end is unmatched
Terminal impedance (or terminal resistance).For example, this mismatch between receiver and transmission line impedance may cause at receiver
Signal reflex.
In order to improve the matching between transmission line 105 and the impedance (or resistance) of receiver 103, and thus reduce or most
Smallization line of propagation 105 travels to the reflection of the signal of receiver 103, terminal coupling circuit 107 can be used, as shown in Figure 1B.
The terminal coupling circuit 107 of " changeable terminal " shown in such as Figure 1B can be with receiver 103 parallel across transmission line 105
Terminal coupling.Terminal coupling circuit 107 can have impedance (or resistance) in its terminal (or node), and which improve transmission
Matching between the impedance of line 105 and the combined terminal impedance of receiver 103 and terminal coupling circuit 107.Note that receiver
103 can more generally be configured as receiving or sending the transceiver or other equipment of signal by transmission line 105.At other
In example, terminal coupling circuit 107 can not be used together with receiver 103；In such an example, terminal coupling circuit
107 can reduce the signal reflex at the open end of transmission line 105.
As shown in Figure 1B, terminal coupling circuit 107 can be the stand-alone assembly independently of receiver 103.Alternatively, terminal
Can be fully-integrated with receiver 103 with circuit 107, and therefore can in receiver 103 with the terminal of receiver or section
Point couples in parallel, as shown in Figure 1 C.Note that term node and terminal are used synonymously in the disclosure.
Fig. 2 shows an exemplary means framves of the changeable terminal coupling circuit 207 for providing 120 ohm termination impedances
Structure.In the device architecture of Fig. 2, terminal coupling electricity is selectively activated or deactivated using enabled (TE) input is terminated
Road.When TE input is high (H), control circuit opens FET device, in node/provide 120 ohm (=60 between terminal A and B
+ 60 ohm of ohm) terminal impedance.Control circuit may include charge pump circuit, level shifter circuit or isolator circuit, example
Such as, FET device is enable to drive to be more than the voltage of supply voltage.In addition, being put to provide electrostatic to terminal coupling circuit
Electric protection, static discharge (ESD) are electrically connected between each node/terminal (A, B) and ground.Esd protection circuit or device are protected
The circuit in electronic device is protected from static discharge or other energy surges, to prevent the failure or damage of electronic device and its circuit
It is bad.ESD circuit generally includes a voltage clamping device, the uneasy full operation of circuit or device for blocking it protecting
Condition.
Depending on application, used transmission line 105 or type, the characteristic of receiver 103 of cable etc., it may be necessary to no
With termination impedance value the impedance matching provided by terminal coupling circuit 107 is provided.For example, the typical case packet of differential termination
RS485 or TIA/EIA-485-A standard usually with 120 ohm terminations is included, or usually with the RS422 of 100 ohm terminations
Or TIA/EIA-422-B standard.
The terminal coupling circuit 107 of appropriate terminal coupling can be provided for different application in order to provide, it may be necessary to have
The terminal coupling circuit 107 of adjustable terminal impedance (or resistance).It can as the changeable terminating circuit offer of Figure 1B and Fig. 1 C
Termination impedance is adjusted, and its illustrative embodiments will be discussed in further detail below.
Fig. 3 shows an example of changeable terminal coupling circuit 307.The circuit of Fig. 3 includes that two terminals are enabled
(TE) it inputs: TE1 and TE2.When TE1 is low and TE2 is high, control circuit 1 (control 1) is opened in control circuit 2 (control 2)
When disconnect, and 120 ohm termination impedances are provided between node or terminal A and B.But when TE1 and TE2 are high, control
Circuit 1 and 2 processed is both turned on, and provide between node or terminal A and B 100 ohm termination impedances (correspond to 120 ohm with
600 ohm of parallel connections).The circuit of Fig. 3 therefore can be provided advantageously between a node or terminal A and B two it is different optional
The impedance matching value selected.
As in the case of figure 2, the circuit of Fig. 3 includes the ESD circuit for being coupled to each node or terminal (A, B).
Above discussion describes the two different termination impedance values that can be provided by the circuit of Fig. 3.More generally, may be used
To obtain other impedance values.For example, control circuit 1 (control 1) is being controlled by setting high level and low value for TE1 and TE2 respectively
Circuit processed 2 (control 2) is connected while closing, and in node/provide 600 ohm termination impedances between terminal A and B.In addition,
By setting low value for TE1 and TE2, control circuit 1 and 2 is turned off, and provides open circuit termination impedance.In this way, the lose-lose of Fig. 3
Entering terminal coupling circuit can be in a node/provide two or more (such as four) resistance of different selections between terminal A and B
Anti- matching value.More generally, the circuit of Fig. 3 can be extended to include the enabled input (TE1 ... TEn) of n terminal, each terminal
Enabled input is connected to corresponding control circuit (for example, corresponding one in n control circuit), FET (for example, in n FET
Corresponding one) and one or more resistor or impedance (for example, corresponding one in n group resistor or impedance).At this
In one general example of sample, circuit can provide up to 2nA different impedance termination value.
Example shown in Fig. 3 includes 600 ohm of the total impedance under the control of first control circuit and controls second
120 ohm of total impedance under the control of circuit processed, and 100 ohm, 120 ohm, 600 ohm of terminal impedance can be provided
Value, and open a way.Other impedance values can be used.For example, by providing about 100 ohm under the control of first control circuit
Total impedance, and provide under the control of second control circuit about 120 ohm of total impedance, terminal coupling circuit can mention
For about 54.5 ohm, 100 ohm, 120 ohm of termination impedance value, and open a way.Note that although existing for illustrative purposes
This discusses specific impedance value (for example, 100 ohm, 120 ohm), but other impedance values also can be used.For example, can make
With about 100 ohm or 120 ohm of impedance values (for example, 100 ohm of +/- 5%, 120 ohm of +/- 5%) and other impedances
Value (such as 20 ohm, 80 ohm, 1000 ohm ...).
Although the circuit of Fig. 3 advantageously provides changeable/selectable impedance termination, which needs multiple terminations
Enabled input/signal, multiple control circuits (each TE inputs one), multiple FET devices (each control circuit one) and
Multiple groups resistor.Due to having used a large amount of component in the circuit of Fig. 3, so the realization of the circuit may be relatively expensive.Separately
Outside, if circuit will be expanded to include additional terminal value (for example, third and/or the 4th different termination impedance value),
Need third (and/or 4th) control circuit, FET and resistance group.For example, for providing n termination impedance value (n is positive integer)
Circuit, which may include the n group resistor for being coupled in node/between terminal A and B, n switching device and corresponding n
Group resistor and n control circuit, n control circuit control corresponding one in n switching device.
Fig. 4 provides another changeable impedance termination circuit 407, needs component more less than the circuit of Fig. 3.
In the circuit of Fig. 4, it is multiple and different that single terminal enables (TE) input, single control circuit and single FET offer
Impedance matching value.Control circuit can be similar to the control circuit of Fig. 2 and Fig. 3, and may include charge pump, level shift
Device circuit or isolator circuit are to drive the grid of FET device with activating appts.More generally, the control circuit of Fig. 2,3 and 4 can
According to the type of used switch (N-type FET, p-type FET or other switchtypes).Booster circuit or negative voltage generate electricity
Road can respectively include charge pump, level shifter circuit or isolator circuit or other circuits appropriate for generating control voltage
To be applied to the control terminal (for example, grid of FET device) of switch.
In use, Fig. 4 is selected by adjusting the connectivity of multiple output nodes of impedance matching circuit 407 or terminal
Circuit impedance matching value.In order to provide 120 Ohm terminations, using output node/terminal A and B120 at output node/end
120 ohm of (=60 ohm+40 ohm+20 ohm) terminal impedances are provided between end.Alternatively, if necessary to 100 ohm terminations, then
100 ohm of (=60 ohm+40 ohm) terminal resistances are provided between output node/terminal using output node/terminal A and B100
It is anti-.The impedance value (for example, 60 ohm, 40 ohm, 20 ohm ...) discussed in entire disclosure for illustration purposes, and can
To use other impedance values.It is, for example, possible to use about 60 ohm, 40 ohm or 20 ohm of impedance value (such as 60 ohm+/
5% ...) and other impedance values (such as 5 ohm, 500 ohm, 1000 ohm ...).
As shown in figure 4, changeable terminating circuit 407 includes ESD circuit in each node/terminal A, B100 and B120.
In order to avoid needing ESD circuit on node/terminal B100, when needing 100 ohm of output impedance, output section
Point/terminal B100 and B120 can be short-circuit together.Output node/terminal B100 and B120 short circuit effectively makes 20 Ohmic resistances
Short circuit.In the case where node/terminal B100 and B120 is electrically short-circuited to each other, output node/between terminal A and B100/B120 again
100 ohm of (=60 ohm+40 ohm) terminal impedances of secondary offer.Further, since node/short between terminal B100 and B120
Road, node/terminal B100 may not be needed ESD circuit.Therefore, the showing using short circuit in node/between terminal B100 and B120
In example, it is only necessary to be connected to two ESD circuits of each node/terminal A and B120.However, still can optionally node/
Third ESD circuit is provided at terminal B100, so as to when node/terminal B100 is not with node/terminal B120 short circuit, such as is assembled
Period is provided to node/terminal B100 electrostatic discharge (ESD) protection.Third ESD circuit (being connected to node/terminal B100) can have
There are the size or capacity (for example, smaller size or capacity) different from node or terminal A and B120, or can be with node
Or the size at terminal A and B120 is identical.
In example in front, ESD circuit is shown positioned at node/terminal (for example, A, B, B100, B120) and ground
Between.It alternatively, or in addition, can be in a node/provide ESD circuit between terminal A and B (or A and B120), to provide pair
The protection of FETD-S voltage.In addition, the ESD circuit at node/terminal B100 can connect in node/between terminal and ground, such as
Shown in Fig. 4 or between node/terminal B100 and node/terminal B120.In addition, FET device used in these circuits can be with
It is N-type or p-type, or other kinds of switching device can be used.In general, FET resistance is not zero, and can be by that can cut
It changes in the calculating of the terminal impedance of termination impedance circuit offer and considers.
Aforementioned exemplary concentrate at its node or terminal provide two selectable impedance values (for example, 100 ohm and
120 ohm) circuit.More generally, circuit can be designed as providing different impedance values (for example, 80 ohm, 140 Europe
Nurse ...) and/or provide other different impedance values (for example, n different impedance selectable value, wherein n is positive integer).Example
Such as, according to introduction given here, the circuit of Fig. 4 can be extended be include that additional node/terminal and additional impedance are whole
Only it is worth.In a specific example, the circuit of Fig. 4 can be modified to include fourth node/terminal B140 and being coupled in section
The additional impedance element (for example, 20 ohmic resistors) of point/between terminal B120 and B140, so as in node/terminal A and B140
Between 140 ohm of the selectable impedance value of third is provided.In this additional example, it can be mentioned at node/terminal B140
For full-scale ESD circuit, and ESD circuit can be provided at node/terminal B120 or smaller size of ESD electricity is provided
Road.Other nodes or terminal (for example, B150, B160 ...) and other resistor are (for example, be connected to a node/end
Between the B140 and B150 of end, it is connected to node/between terminal B150 and B160 ...) it may be used to provide and further may be used
The impedance value of selection.
The further example of the device architecture for terminal coupling circuit to can be switched is provided in Fig. 5-9.Fig. 5's
In example, changeable terminal coupling circuit 507 is provided, architecture shown in Fig. 3: switching device is approximately similar to
FET1 holding is connected with a node/resistor R1 between terminal A and B, and switching device FET2 is kept and a node/terminal A
Resistor R2 series connection between B.However, at least one booster resistor (R3) is provided, so that in FET device in circuit 507
Resistor network is provided between part and node/terminal B.The terminal impedance provided by circuit 507 therefore will be by resistor network
Equivalent resistance provides, and wherein the equivalent resistance of resistor network is determined based on which FET device conducting.Specifically, if
FET1 is individually connected, then provides the terminal impedance of the R1 in parallel with R2+R3；If only FET2 is connected, provide in parallel with R1+R3
R2 terminal impedance；And if FET1 and FET2 are connected, the terminal impedance of the R1 in parallel with R2 is provided.As a result, can
To provide multiple and different termination impedance values.
In the example of Fig. 6 and Fig. 7, changeable terminal coupling circuit 607 and 707 is provided, they are Fig. 3 and 4
The combination of structure.In circuit 607 and 707, multiple switch/FET device is provided, and three or more output sections are provided
Point/terminal (for example, A, B1 and B2).As a result, can by multiple switch/FET device selective activation and by node/
The selectivity of terminal A+B1 or A+B2 is using providing multiple and different termination impedance values.Particularly, it is mentioned by circuit 607 and 707
The terminal impedance of confession will be provided by the equivalent resistance of resistor network, and wherein which FET the equivalent resistance of resistor network is based on
During break-over of device and which terminal (A+B1 or A+B2) are used.
Finally, provide changeable terminal coupling circuit 807 and 907 in the example of Fig. 8 and Fig. 9, their substantially classes
Be similar to structure shown in Fig. 4: single switch/FET device and single control circuit provide multiple and different impedance matching values.So
And in circuit 807 and 907, resistor network is provided between switch/FET device and each output terminal B1, B2 and B3.By
Therefore the terminal impedance that circuit 807 and 907 provides will be provided by the equivalent resistance of resistor network, wherein based on being exported using which
Node/terminal B1, B2 and B3 determines the equivalent resistance (and/or short circuit) of resistor network.As a result, can provide multiple and different
Termination impedance value.
As described above, each the control circuit in changeable terminal coupling circuit for being selectively enabled/open or
The corresponding switching device of disabling/closing (such as FET device).In some instances, control circuit may include such as non-volatile
Property memory or latch etc memory component, even if so that each control circuit in the input TE not receive control defeated
It is fashionable to be also able to maintain its state (for example, enabling/opening or the corresponding switching device of disabling/closing).In such an example,
It can be by setting desired value for each memory component to program changeable terminal coupling circuit, and once compiled
Journey, so that it may using changeable terminal coupling circuit without inputting TE signal during operation.In this way, be once programmed,
Even if changeable terminal coupling circuit also can be used in the equipment for not providing TE signal to terminal coupling circuit.
Although not shown in the drawings, still various changeable terminal coupling circuits shown and described herein are usually received and are used for
The external power of operation.For this purpose, each changeable terminal coupling circuit may include receive power power supply (for example,
Vdd) terminal and ground terminal.When control circuit provides this circuit, the power supply from power supply terminal is for drive control electricity
The operation on road, the power supply including charge pump, level shifter or isolator circuit.In this case, charge pump, level shift
Device or isolator circuit, which can be used from the received power of power supply terminal, drives the grid of FET device electric to power supply terminal is higher than
The voltage of pressure (or in some instances, lower than lower power end voltage or ground voltage).In alternative exemplary, control electricity
Road can obtain power from the TE input terminal of changeable impedance termination circuit, and the changeable impedance termination in such example
Therefore circuit can not need individual power supply terminal.In further example, control circuit can be changeable from being connected to
The transmission line of impedance termination circuit obtains power, and the changeable impedance termination circuit in such example therefore can not
Need individual power terminal.
Unless otherwise stated, all measurements proposed in this specification (including in subsequent claims)
Value, value, grade, position, magnitude, size and other specifications are all approximate, rather than accurate.They are intended to have reasonable
Range, the range are consistent with the convention of their related functions and their fields.
Protection scope is only limitted to the claim followed now.It is carried out when according to this specification and subsequent prosecution history
When explaining and covering all structure and function equivalents, which is intended to and should be interpreted and make in the claims
The consistent range of the ordinary meaning of language.Nevertheless, being intended to cover not meet Patent Law without a claim
101, the theme of 102 or 103 requirements, should not also explain in this way.Any unexpected such theme is abandoned herein.
Over and above what is described above, the content of any statement or explanation is all not intended to or should be interpreted to cause to the public's
The devotion of any component, step, feature, object, interests, advantage or equivalent, no matter whether it enumerates in the claims.
It should be understood that terms and expressions used herein are with corresponding respective relative to them with these terms and expressions
Inquiry and the consistent ordinary meaning of research field, unless in addition elaborating specific meaning herein.First and second etc.
Relational terms can be only used for distinguish an entity or movement with another entity or movement, without requiring or implying these
Any actual this relationship or sequence between entity or movement.The terms "include", "comprise" or its any other modification purport
Include in covering nonexcludability, so that the process, method, article or the equipment that include element list not only include those elements, and
Being may include being not explicitly listed or such process, method, article or the intrinsic other element of device.Not into one
In the case where step limitation, process, method, article or dress including the element are not precluded within by the element that "a" or "an" starts
Set that middle there are other identical elements.
Disclosure abstract is provided to allow reader quickly to determine property disclosed in technology.Understanding when submission is that it will not
It is used to explain or limit the scope of the claims or meaning.In addition, in the previous detailed description, it can be seen that for letter
Change the purpose of the disclosure, various features are grouped together in various embodiments.Disclosed method is not necessarily to be construed as instead
Reflect the intention that embodiment claimed needs the more features than being expressly recited in each claim.But it is such as following
What claim was reflected, utility model theme is all features less than single open embodiment.Therefore, following right is wanted
It asks and is incorporated into specific embodiment herein, wherein each claim itself is used as independent claimed theme.
Although foregoing have described be considered as optimal mode and/or other exemplary contents, it should be appreciated that, it can
To carry out various modifications wherein, and the introduction can be applied in many applications, only describe some of which here.Institute
Attached claim is intended to any and all applications, the modifications and variations that requirement is fallen into the true scope of this introduction.
Claims (20)
1. a kind of terminal coupling circuit characterized by comprising
First and second nodes；
First interconnected in series of the first switch device and the first impedor that are coupled between first and second node；
Second interconnected in series of the second switch device and the second impedor that are coupled between first and second node；With
First and second control circuits, respectively with the control of the control terminal of the first switch device and the second switch device
Terminal coupling processed,
Wherein by selectively activating first and second switching device by first and second control circuit, described
Selectable impedance is set between first and second nodes of terminal coupling circuit.
2. terminal coupling circuit according to claim 1, which is characterized in that wherein by the first and second switching devices
Between selectively only activate first switch device, be arranged between the first and second nodes of terminal coupling circuit first optional
The impedance value selected, and by the first and second switching devices of activation, between the first and second nodes of terminal coupling circuit
The second selectable impedance value less than the described first selectable impedance value is set.
3. terminal coupling circuit according to claim 1, which is characterized in that further include being respectively coupled to the first and second sections
The first and second static discharges (ESD) circuit of point.
4. terminal coupling circuit according to claim 3, which is characterized in that further include be coupled in the first and second nodes it
Between third static discharge (ESD) circuit.
5. terminal coupling circuit according to claim 1, which is characterized in that wherein every in the first and second control circuits
One all includes charge pump circuit, level shifter circuit or isolator circuit.
6. terminal coupling circuit according to claim 1, which is characterized in that wherein the terminal coupling circuit passes through by
One and second control circuit selectively activate at least one of first and second switching devices, the first and second nodes it
Between about 100 ohm of impedance is selectively set, and by selectively activating first by the first and second control circuits
At least one of with second switch device, about 120 ohm of impedance is set between the first and second nodes.
7. terminal coupling circuit according to claim 6, which is characterized in that wherein the first impedance element of the first interconnected in series
The value of part is about 120 ohm, and the value of the second impedor of the second interconnected in series is about 600 ohm.
8. terminal coupling circuit according to claim 1, which is characterized in that further include:
N interconnected in series of each switching device and respective impedance element is coupled between the first and second nodes, and wherein n is just
Integer；With
N control circuit is respectively coupled to the control terminal of corresponding one switching device in n interconnected in series,
Wherein by selectively activating the switch of first, second and n interconnected in series by first, second and n control circuit
Selectable impedance is arranged between the first and second nodes of terminal coupling circuit in device.
9. a kind of terminal coupling circuit characterized by comprising
First, second, and third node；
The interconnected in series of the switching device and the first impedor that are coupled between the first and second nodes；
Second impedor is coupled between second and third node；With
Control circuit is coupled to the control terminal of switching device,
Wherein by activating switching device by control circuit, selectable impedance is set at the node of terminal coupling circuit.
10. terminal coupling circuit according to claim 9, which is characterized in that wherein by activation switching device, in terminal
First selectable impedance value is set, and by activation switching device, at end between the first and second nodes of match circuit
Hold the second selectable impedance value for being arranged between first and third node of match circuit and being higher than the first selectable impedance value.
11. terminal coupling circuit according to claim 10, which is characterized in that further include:
N node, wherein n is positive integer；With
In a node in n node and n impedor being serially connected between third node, wherein n node
In each of other nodes be coupled to n impedor series connection respective nodes,
Wherein by activation switching device, setting is higher than the first He between the first node and n node of terminal coupling circuit
N in each of second selectable impedance value selectable impedance values.
12. terminal coupling circuit according to claim 9, which is characterized in that wherein by activation switching device and by the
Two nodes are shorted to third node, and the first selectable impedance is arranged between the first and second nodes of terminal coupling circuit
Value, and when second and third node not short-circuit each other, by activating switching device, the first of terminal coupling circuit and the
Setting is higher than the second selectable impedance value of the first selectable impedance value between three nodes.
13. terminal coupling circuit according to claim 9, which is characterized in that further include being respectively coupled to first and third
The first and second static discharges (ESD) circuit of node.
14. terminal coupling circuit according to claim 13, which is characterized in that further include being coupled in first and third node
Between third static discharge (ESD) circuit.
15. terminal coupling circuit according to claim 9, which is characterized in that further include being respectively coupled to the first, second He
The first, second, and third static discharge (ESD) circuit of third node.
16. terminal coupling circuit according to claim 15, which is characterized in that wherein the second ESD circuit is coupled in second
Between third node.
17. terminal coupling circuit according to claim 15, which is characterized in that further include being coupled in first and third node
Between the 4th static discharge (ESD) circuit.
18. terminal coupling circuit according to claim 9, which is characterized in that wherein the control circuit includes that driving is opened
Close charge pump circuit, level shifter circuit or the isolator circuit of device.
19. terminal coupling circuit according to claim 9, which is characterized in that wherein the terminal coupling circuit is first
About 100 ohm of impedance is selectively set between second node, and between first and third node selectively
About 120 ohm of impedance is set.
20. terminal coupling circuit according to claim 19, which is characterized in that be wherein coupled in second and third node it
Between the second impedor there is about 20 ohm of value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201662326334P | 2016-04-22 | 2016-04-22 | |
| US15/493,495 US9960752B2 (en) | 2016-04-22 | 2017-04-21 | Switchable termination with multiple impedance selections |
| US15/493,495 | 2017-04-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208656749U true CN208656749U (en) | 2019-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820580658.8U Active CN208656749U (en) | 2016-04-22 | 2018-04-23 | Terminal coupling circuit |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US9960752B2 (en) |
| CN (1) | CN208656749U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948965A (en) * | 2020-08-14 | 2020-11-17 | 上海博瀛通信科技有限公司 | System and method for controlling external serial port termination resistor of industrial ONU |
| CN111983955A (en) * | 2020-08-20 | 2020-11-24 | 长春净月潭供热有限公司 | Heat supply network data visualization monitoring system |
| CN114361884A (en) * | 2021-12-27 | 2022-04-15 | 西安现代控制技术研究所 | CAN bus terminal resistor automatic matching design method for boxed missile |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10348418B1 (en) | 2014-07-22 | 2019-07-09 | Esker Technologies, LLC | Transient and spurious signal filter |
| US10417143B2 (en) | 2015-10-08 | 2019-09-17 | Esker Technologies, LLC | Apparatus and method for sending power over synchronous serial communication wiring |
| US10128906B2 (en) * | 2016-07-11 | 2018-11-13 | Esker Technologies, LLC | Power line signal coupler |
| US10560154B2 (en) | 2016-07-11 | 2020-02-11 | Esker Technologies, LLC | Power line signal coupler |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5084667A (en) * | 1985-07-26 | 1992-01-28 | Xicor, Inc. | Nonvolatile nonlinear programmable electronic potentiometer |
| US6147520A (en) * | 1997-12-18 | 2000-11-14 | Lucent Technologies, Inc. | Integrated circuit having controlled impedance |
| JP3779056B2 (en) * | 1998-01-30 | 2006-05-24 | 富士通株式会社 | Voltage generation circuit and D / A conversion circuit |
| US6384762B2 (en) * | 2000-01-26 | 2002-05-07 | Microchip Technology Incorporated | Digitally switched impedance having improved linearity and settling time |
| US20020180507A1 (en) * | 2001-05-31 | 2002-12-05 | Via Technologies, Inc. | Resistor network |
| US6812734B1 (en) * | 2001-12-11 | 2004-11-02 | Altera Corporation | Programmable termination with DC voltage level control |
| TWI222271B (en) * | 2003-06-16 | 2004-10-11 | Realtek Semiconductor Corp | Adjustable impedance circuit |
| US20050151576A1 (en) * | 2003-09-23 | 2005-07-14 | Chao-Cheng Lee | Adjustable impedance circuit |
| KR101145333B1 (en) * | 2010-05-31 | 2012-05-15 | 에스케이하이닉스 주식회사 | Impedance adjusting device |
| WO2013009418A1 (en) * | 2011-07-08 | 2013-01-17 | Rambus Inc. | High-speed low-power stacked transceiver |
| CN103684347B (en) * | 2012-09-11 | 2016-07-06 | 瑞昱半导体股份有限公司 | Adjustable impedance circuit and impedance setting method |
| US9595937B2 (en) * | 2014-09-17 | 2017-03-14 | Texas Instruments Incorporated | Programmable step attenuator with cross connection |
-
2017
- 2017-04-21 US US15/493,495 patent/US9960752B2/en active Active
-
2018
- 2018-04-23 CN CN201820580658.8U patent/CN208656749U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948965A (en) * | 2020-08-14 | 2020-11-17 | 上海博瀛通信科技有限公司 | System and method for controlling external serial port termination resistor of industrial ONU |
| CN111983955A (en) * | 2020-08-20 | 2020-11-24 | 长春净月潭供热有限公司 | Heat supply network data visualization monitoring system |
| CN114361884A (en) * | 2021-12-27 | 2022-04-15 | 西安现代控制技术研究所 | CAN bus terminal resistor automatic matching design method for boxed missile |
Also Published As
| Publication number | Publication date |
|---|---|
| US9960752B2 (en) | 2018-05-01 |
| US20170310306A1 (en) | 2017-10-26 |
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Effective date of registration: 20211203 Address after: Limerick Patentee after: ANALOG DEVICES INTERNATIONAL UNLIMITED Co. Address before: California, USA Patentee before: Linear Technology Corp. |
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